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Water soluble polymers as inkjet recording materials

a technology of water soluble polymers and inkjet printing, which is applied in the direction of duplicating/marking methods, coatings, printing, etc., can solve the problems of color distortion, reduced image resolution, and greatly affected image quality of such printers

Inactive Publication Date: 2005-11-10
CHEN TIENTEH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although modem ink jet printers can print on almost any conventional paper or similar medium, and indeed are routinely used with commercial photocopying paper for printing text, the quality of images produced by such printers is greatly affected by the properties of the medium used.
On the other hand, the medium should not promote excessive spreading of the ink droplet, since such spreading reduces image resolution and may result in color distortion if adjacent ink droplets intermix.
The medium must be capable of absorbing the ink without substantial distortion of the medium, since otherwise unsightly “cockling” (formation of ripples and similar folds) may occur, and most observers find such distortions unacceptable.
However, these copolymers do not have adequate image quality and usually have poor smudge and finger print resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Synthesis of PVP / PVA (70 / 30) Copolymer (P-1)

[0026] PVP / PVA copolymer was obtained by hydrolyzing PVP / PVAc (E-735) (70% PVP, 30% PVAc). This was accomplished by combining PVP / VAc with NaOH (1:1) in water / alcohol mixture. The specific amounts of the components are given below in Table 1.

TABLE 1Hydrolysis of PVP / PVAc E-735 (by ISP)wt(g)Eq. (PVAc)PVP / PVAc E-735 (50%1000.178in ethanol)NaOH (30% in water)23.70.178Deionized water100

[0027] The initial pH of the PVP / PVAc was 5.18 before the NaOH was added. The initial pH was 1.3.6 after the NaOH was added.

[0028] The hydrolysis reaction was conducted at 50-65° C. in a beaker equipped with a thermometer and pH meter.

[0029] The reaction time of the hydrolysis was approximately 3 hours. The final pH of the reaction was 8.7. The solution was then neutralized with 5% acetic acid to pH 7.0.

example 2

Synthesis of PVP / PVA(50 / 50) Copolymer (P-2)

[0030] PVP / PVA copolymer was obtained by hydrolyzing PVP / PVAc E-535 (50% PVP, 50% PVAc). Reaction conditions were the same as for hydrolysis of E-735 and E-335 in Examples 1 and 2 respectively. Polymer did not precipitate when 30 ml water was added. 47 grams of 30% NaOH was added over 5 minutes. pH dropped from 13.0 fairly fast to 9.5. Remaining NaOH was also added. pH stopped at 12.2. 3 M HCl was added to bring down the pH to 7.2. The solution's color changed from light brown to pale yellowish. The solution was stirred at 65-70° C. to remove ethanol. The specific amounts of the components are given below in Table 2.

TABLE 2Hydrolysis of PVP / PVAc E-535 (by ISP)wt(g)Eq. (PVAc)PVP / PVAc E-535 (50%1520.44in ethanol)NaOH (30% in water) 590.44Deionized water30 (after all NaOHadded)

example 3

Synthesis of PVP / PVA(30 / 70) Copolymer (P-3)

[0031] PVP / PVA copolymer was obtained by hydrolyzing PVP / PVAc E-335 (30% PVP, 70% PVAc). The reaction conditions were the same as for the synthesis of P-1 and P-2. The specific amounts of the components are given below in Table 3. The solution stayed clear when 37 g of water were added to warm E-335 solution in 50% ethanol. 30 grams of 30% NaOH was added first over 5 minutes. pH dropped rapidly from 12.5 to 7.7 after one hour. 6 g more of 30% NaOH was added further. pH dropped much more slowly to 11.0. Reaction was stopped with HCl to pH 7.0. The solution was cooled to room temperature.

TABLE 3Hydrolysis of PVP / PVAc E-335 (by ISP)wt(g)Eq. (PVAc)PVP / PVAc E-335 (50%740.30in ethanol)NaOH (30% in water)360.27Deionized water37 (added to warmE-335 solution)

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Abstract

The use and preparation of poly(vinylpyrrolidone (PVP)-co-vinylalcohol (PVA)) as inkjet recording material, the method of making PVP / PVA copolymer comprising the steps of: hydrolyzing PVP / polyvinyl acetate (PVAc) copolymer with a mixture comprising water, at least one alcohol and at least one strong base.

Description

FIELD OF THE INVENTION [0001] The application relates to the use and preparation of poly(vinylpyrrolidone (PVP)co-vinylalcohol (PVA)) as inkjet recording material. BACKGROUND OF THE INVENTION [0002] Ink jet printers, that is to say, printers which form an image by firing a plurality of discrete drops of ink from one or more nozzles on to the surface of a recording sheet placed adjacent the nozzles, have recently enjoyed a large increase in sales. Such ink jet printers have the advantage that they can reproduce good quality text and images, in both monochrome and full color, can produce both reflection prints and transparencies, and are relatively inexpensive to manufacture and to operate. Accordingly, ink jet printers now dominate the home / small office market, and are often also used to provide color capability not available from the monochrome laser printers typically employed in larger offices. [0003] Although modem ink jet printers can print on almost any conventional paper or si...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B41M5/00B41J2/01B41M5/50B41M5/52C08F8/12
CPCB41M5/5254B41M5/52
Inventor CHEN, TIENTEH
Owner CHEN TIENTEH